Last July, Israel arrested Adnan, a 37-year-old father of six from the West Bank city of Jenin, for the 10th time under so-called "administrative detention," which allows imprisonment of indefinite duration without trial. Israel says the measure is employed to prevent violence.
Adnan began his hunger strike on May 4, ending his protest on June 28 after Israel agreed to release him. He was then hospitalized in a critical condition, having ingested nothing but water for 56 days.
It was Adnan's second hunger strike in detention. He refused food for 66 days in 2012 in a similar protest, which also ended with his release.
Danger of violence
The Palestinian government had warned that it held Israel responsible for Adnan's fate, and both sides had feared that his death could fuel further violence in the region.
Israel has sought to introduce legislation allowing prisoners to be force-fed, but the proposed measure has been met with several legal obstacles.
Islamic Jihad opposes a two-state solution to the Israeli-Palestinian conflict.